Question

сократите дробь
1) 15x²y^6/9x³y⁴
2) b²+10b+25/5b+25
3) 4-y²/y²-4y+4

Answer 1

$1) frac{ 15x^{2} y}{9 x^{3} y^{4} }= frac{5}{3xy^{3} }$

$2) frac{ b^{2}+10b+25 }{5b+25}= frac{ (b+5)^{2} }{5(b+5)}= frac{b+5}{5}$

$3) frac{4- y^{2} }{ y^{2} -4y+4}= frac{(2-y)(2+y)}{4-4y+ y^{2} } = frac{(2-y)(2+y)}{( 2-y)^{2} } = frac{2+y}{2-y}$